Wiring exits the light through a hole in the body behind the mounting boss.
Halogen Silver Bullets & Single function L.E.D. Reflector Style Silver Bullets have a single power wire & ground through their mount.
Dual function L.E.D. Reflector Style Silver Bullets have three wires; run, flash, & ground. They cannot be used for run-brake applications because they do not change intensity; they go from steady-on to on-off flash.